There's more than 10 thousand alts and tokens in the market but only one Bitcoin.
Quite a positive argument!
Personally, I was having a very difficult time coming across a topic like this which asking why should I buy only bitcoins and not altcoins? But now you have opened my mind! Altcoins are plentiful though some of them are profitable, but they still can't achieve the quality of Bitcoin because it really exists on its own and it is the very first!